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Marketable Securities - Additional Information (Detail) (USD $) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Jan. 31, 2015 | Jan. 31, 2014 | Jan. 31, 2015 | Jan. 31, 2014 | Apr. 30, 2014
Schedule Of Marketable Securities [Line Items] |  |  |  |  |  |  |  |
Proceeds from sales/maturities of available-for-sale securities | $ 1,000,000 us-gaap_ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities |  | $ 0 us-gaap_ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities | $ 3,000,000 us-gaap_ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities |  | $ 33,300,000 us-gaap_ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities |  |
Trading securities | 133,655,000 us-gaap_TradingSecurities | [1],[2] |  | 133,655,000 us-gaap_TradingSecurities | [1],[2] |  | 116,207,000 us-gaap_TradingSecurities | [1],[2]
Gross unrealized gains | 4,800,000 kfy_TradingSecuritiesUnrealizedHoldingGainAccumulatedInInvestments |  |  | 4,800,000 kfy_TradingSecuritiesUnrealizedHoldingGainAccumulatedInInvestments |  |  | 9,200,000 kfy_TradingSecuritiesUnrealizedHoldingGainAccumulatedInInvestments |
Gross unrealized losses | $ 300,000 kfy_TradingSecuritiesUnrealizedHoldingLossAccumulatedInInvestments |  |  | $ 300,000 kfy_TradingSecuritiesUnrealizedHoldingLossAccumulatedInInvestments |  |  | $ 700,000 kfy_TradingSecuritiesUnrealizedHoldingLossAccumulatedInInvestments |
Minimum |  |  |  |  |  |  |  |
Schedule Of Marketable Securities [Line Items] |  |  |  |  |  |  |  |
Available-for-sale marketable securities, remaining maturities |  |  |  | 1 month |  |  |  |
Maximum |  |  |  |  |  |  |  |
Schedule Of Marketable Securities [Line Items] |  |  |  |  |  |  |  |
Available-for-sale marketable securities, remaining maturities |  |  |  | 1 year |  |  |  |
[1] | These investments are held in trust for settlement of the Company's vested and unvested obligations of $127.8 million and $117.6 million as of January 31, 2015 and April 30, 2014, respectively, under the ECAP (see Note 6 - Deferred Compensation and Retirement Plans). During the three months ended January 31, 2015, the fair value of investments decreased; therefore, the Company recognized a loss of $0.2 million, which was recorded in other (loss) income, net. For the nine months ended January 31, 2015, the fair value of the investments increased; therefore, the Company recognized income of $4.3 million, which was recorded in other (loss) income, net. During the three and nine months ended January 31, 2014, the fair value of the investments increased; therefore, the Company recognized income of $1.2 million and $7.6 million, respectively, which was recorded in other (loss) income, net.
[2] | The Company's financial assets measured at fair value on a recurring basis include trading securities classified as Level 1 and available-for-sale securities classified as Level 2. As of January 31, 2015 and April 30, 2014, the Company had no investments classified as Level 3.

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